Solutions to the request reassignment problem in collaborative carrier networks

The paper considers an arrangement for exchanging transportation requests to facilitate collaboration among independent carriers. The goal is to maximize the total profit without decreasing the individual profit of the carriers. Two solution approaches are developed for this problem involving decentralized control and auction based exchange mechanisms. The results are compared with those obtained without collaboration and by a centralized control. They indicate that horizontal collaboration pays off even in highly competitive environments.     

Collaborative innovation and policy support: the emergence of trilateral networks

ABSTRACT

The present article models the critical factors for a successful and evolutionarily stable National System of Innovation. We simulate a model, against the background of increasingly complex technologies, in a national process of agents’ interactions with social-dilemma characteristics. In particular, the articleinvestigates the emergence of a trilateral collaborative innovation alliance among ‘enterprise’, ‘university’ and ‘government’. We apply a tripartite evolutionary game with a replication process and explore the role and options of the public policy agent to support collaboration on innovation. We find that some policy mix, in particular, a combination of (1) public rewards for cooperation, (2) public punishment for non-cooperation and (3) settings of public cost controls and tax income from innovation, can promote broad and sustainable innovation alliances. For instance, threats of strong punishment, even with low public rewards for cooperation, may promote the formation of a collaborative innovation alliance. We run some sensitivity analyses of the results through parametric variation of two critical factors of the model, knowledge spillover and output elasticity of knowledge input. We find some qualifications for the velocity of the process.     

Assessment of Brazil's research literature

This ‘country study’ analyses substantial samples of research papers by Brazilian authors drawn from two global databases. The approach and the findings may each be of interest. Our approach is to examine R&D outputs through bibliometrics (to identify key authors, institutions, journals, etc.) and text mining with taxonomy generation (to identify pervasive research thrusts). We extend prior country studies by providing for interactive data access and exploring military-relevant R&D information. The resulting publication activity profiles provide insight on Brazilian R&D strengths and investment strategies, and help identify opportunities for collaboration. Brazil, a nation of 190 million, evidences a substantial research enterprise, with major capabilities in the life and biomedical sciences, as well as the physical sciences. We benchmark research patterns and trends against several other countries. We find a large measure of international collaboration, particularly with the USA.     

Factor price equalization? The cointegration approach revisited

Conclusions Absolute factor price equalization across countries is a key prediction of the Heckscher-Ohlin-Samuleson model of international trade, one of the more influential “workhorse” models in economics. Despite its theoretical might, the factor price equalization hypothesis has received surprisingly little empirical support. In an important exception to the rule, Burgman and Geppert (1993) argue that this might be due to the neglect of the non-stationarity of the time series under consideration. And indeed, applying a cointegration approach to (nominal) unit labor costs in six major industrialized countries (Canada, France, Germany, Japan, the United Kingdom, and the United States), they find evidence of long-run factor price co-movement. This finding can be interpreted as being in line with equalization of factor prices amongst these countries.     

How Do Large Banking Organizations Manage Their Capital Ratios?

U.S. banks hold significantly more equity capital than required by their regulators. We test competing hypotheses regarding the reasons for this “excess” capital, using an innovative partial adjustment approach that allows estimated BHC-specific capital targets and adjustment speeds to vary with firm-specific characteristics. We apply the model to annual panel data for publicly traded U.S. bank holding companies (BHCs) from 1992 through 2006, an extended period of increasing bank capital that ended just before the subprime credit crisis of 2007–2008. The evidence suggests that BHCs actively managed their capital ratios (as opposed to passively allowing capital to build up via retained earnings), set target capital levels substantially above well-capitalized regulatory minima, and (especially poorly capitalized BHCs) made rapid adjustments toward their targets.     

TIME VARIABILITY IN MARKET RISK AVERSION

We adopt realized covariances to estimate the coefficient of risk aversion across portfolios and through time. Our approach yields second moments that are free from measurement error and not influenced by a specified model for expected returns. Supporting the permanent income hypothesis, we find risk aversion responds to consumption-smoothing behavior. As income increases, or as the consumption-to-income ratio falls, relative risk aversion decreases. We also document variation in risk aversion across portfolios: risk aversion is highest for small and value portfolios.     

Fictitious play in 2×n games

It is known that every discrete-time fictitious play process approaches equilibrium in nondegenerate 2×2 games, and that every continuous-time fictitious play process approaches equilibrium in nondegenerate 2×2 and 2×3 games. It has also been conjectured that convergence to the set of equilibria holds generally for nondegenerate 2×n games. We give a simple geometric proof of this for the continuous-time process, and also extend the result to discrete-time fictitious play.     

Stochastic modelling of herd behaviour indices

This paper proposes different diffusion processes to model herd behaviour indices such as the Herd Behaviour Index (HIX). These models arise by combining popular mean-reverting processes with simple algebraic functions mapping the definition domain of the underlying mean-reverting process to the unit interval. The so obtained Itô processes preserve, to some extent, the mean-reverting trend of the underlying process while satisfying the fundamental properties of the so-called herd behaviour indices. In a numerical study, we calibrate the different model settings to time series data for a period spanning from January 2000 until October 2009 and investigate their ability to predict the future behaviour of herd behaviour indices.     

Is Fiscal Policy Procyclical in the Euro Area?

We test the relationship between the cyclically adjusted primary balance and alternative indicators of cyclical conditions for the euro area and 18 OECD countries over the period 1970–2009. A countercyclical stance of discretionary fiscal policy is found during bad times after 1999 in the euro area as a whole and in a few member countries only (France, Ireland and The Netherlands). It is also associated with high public deficits or low public debts. There is no significant case of procyclical fiscal policy after 1999, neither in good times nor in bad times.